I've done poe, Vog, crota... haven't found it
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Legacy engrams
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If you aren't missing many other yr1 primaries, you could try legacy primary engrams. Only worth it if you're only missing 1 or 2 primaries as you'll just get them.
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The only "guaranteed" ways to obtain the Red Death are to have owned it in Year 1 and purchased the Year 2 version from the Exotic Weapons blueprints kiosk, or for Xur to eventually/hopefully sell it. Aside from that, you gotta hope it drops. Pop dem 3 of Coins!
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It's an exotic drop, just get lucky